CN110226041B

CN110226041B - Hermetic compressor

Info

Publication number: CN110226041B
Application number: CN201880008443.1A
Authority: CN
Inventors: 昆努; 饭塚敏
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2017-01-27
Filing date: 2018-01-17
Publication date: 2021-08-10
Anticipated expiration: 2038-01-17
Also published as: CN110226041A; JP6748874B2; EP3575605A1; WO2018139308A1; EP3575605B1; EP3575605A4; JP2018119503A

Abstract

A sealed compressor in which a rotary shaft oil supply hole (13c) is formed in a rotary shaft (13), an oil groove (13f) and a horizontal hole (13g) are formed in a lower end portion (13b) of the rotary shaft (13), a plate-side oil passage (42) is formed in a thrust bearing plate (40), a housing-side oil passage (51) is formed in an oil pump housing (50), lubricating oil supplied from the horizontal hole (13g) is moved downward in the oil groove (13f) by bringing the upper portion of a sliding bearing (13e) into contact with the rotary shaft (13) at an upper portion above the oil groove (13f), and lubricating oil in the oil groove (13f) is discharged below a sub-bearing (18) through the plate-side oil passage (42) and the housing-side oil passage (51), whereby the lubricating oil can be prevented from being discharged to the upper portion of the sub-bearing (18).

Description

Hermetic compressor

Technical Field

The present invention particularly relates to a hermetic compressor used for a refrigerator such as an air conditioner, a water heater, or a refrigerator.

Background

A hermetic compressor is used in a refrigeration device or an air conditioning device, and the hermetic compressor sucks a gas refrigerant evaporated by an evaporator, compresses the gas refrigerant to a pressure required for condensation by a condenser, and sends the high-temperature and high-pressure gas refrigerant to a refrigerant circuit.

In such a hermetic compressor, a compression mechanism for compressing a refrigerant and an electric mechanism for driving the compression mechanism by a rotary shaft are disposed in a sealed container, and an oil reservoir for storing lubricating oil is formed in the bottom of the sealed container. The upper part of the rotating shaft is supported by a main bearing, and the lower part of the rotating shaft is supported by a secondary bearing.

A rotating shaft oil supply hole is formed in the rotating shaft from the lower end to the upper end, and the lower end of the rotating shaft is provided with an oil groove and a transverse hole for communicating the rotating shaft oil supply hole and the oil groove.

With this configuration, the lubricating oil residing at the bottom of the hermetic container is guided to the main bearing and the sub-bearing by the rotating shaft oil supply hole.

For lubrication of the sub-bearing, patent document 1 discloses a structure in which a through hole is formed in the pump cover and the lubricating oil that lubricates the sub-bearing is returned to the oil reservoir, and patent document 2 discloses a structure in which a through hole is formed in the thrust plate and the lubricating oil that lubricates the sub-bearing is returned to the oil reservoir.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 5-231357

Patent document 2: japanese laid-open patent publication No. 11-182473

Disclosure of Invention

Problems to be solved by the invention

However, when the lubricating oil guided to the sub-bearing flows out from the upper portion of the sub-bearing, the lubricating oil scatters due to the rotation of the motor, and the amount of the lubricating oil discharged from the sealed container to the outside increases.

In patent documents 1 and 2, although the lubricant oil that lubricates the sub-bearing is guided downward by forming the through hole in the pump cover or the thrust plate, the lubricant oil is also caused to flow out from the upper portion of the sub-bearing.

Accordingly, an object of the present invention is to provide a hermetic compressor capable of preventing the lubricating oil from being discharged to the upper portion of the sub-bearing.

Means for solving the problems

A hermetic compressor according to the present invention described in claim 1 is a hermetic compressor in which a compression mechanism for compressing a refrigerant and an electric mechanism for driving the compression mechanism by a rotating shaft are disposed in a hermetic container, and an oil reservoir for storing a lubricating oil is formed in a bottom portion of the hermetic container, the hermetic compressor including: a main bearing for supporting an upper portion of the rotating shaft; a sub-bearing for supporting a lower end portion of the rotary shaft; a sliding bearing disposed between the sub-bearing and the rotating shaft; a thrust bearing plate disposed below the auxiliary bearing and receiving thrust of the rotary shaft; an oil pump housing disposed below the thrust bearing plate; and a positive displacement oil pump housed in a lower surface of the oil pump housing, wherein a rotation shaft oil supply hole is formed in the rotation shaft from the lower end portion of the rotation shaft to the upper portion of the rotation shaft, and the positive displacement oil pump includes: an oil groove formed by a notch in the axial direction of the rotating shaft; and a lateral hole that communicates the rotating shaft oil supply hole with the oil groove, wherein a plate-side oil passage that intermittently communicates with the oil groove is formed in the thrust bearing plate, a case-side oil passage that communicates with the plate-side oil passage is formed in the oil pump case, and an upper portion of the sliding bearing is brought into contact with the rotating shaft at a position above the oil groove, whereby the lubricating oil supplied from the lateral hole is moved downward in the oil groove, and the lubricating oil in the oil groove is discharged below the sub-bearing via the plate-side oil passage and the case-side oil passage.

The present invention according to claim 2 is the hermetic compressor according to claim 1, wherein: an oil reservoir space for storing the lubricating oil discharged from the oil pump is formed in the center of the thrust bearing plate, and the plate-side oil passage is formed so as to communicate with the oil reservoir space and to extend in the radial direction from the oil reservoir space.

The present invention according to claim 3 is the hermetic compressor according to claim 2, wherein: the casing side oil passage is composed of an inner groove and an outer groove formed in an upper surface of the oil pump casing, and a discharge hole formed in an outer end of the outer groove, and the inner groove and the plate side oil passage are overlapped and communicated with each other, and the outer groove is covered with the thrust bearing plate.

The present invention according to claim 4 is the hermetic compressor according to claim 3, wherein: the outer groove covered with the thrust bearing plate has a cross-sectional area equal to or smaller than the cross-sectional area of the lateral hole.

The present invention according to claim 5 is the hermetic compressor according to

claim

3 or 4, wherein: the discharge hole is formed to penetrate the upper and lower surfaces of the oil pump housing.

Effects of the invention

According to the present invention, the upper portion of the sliding bearing is brought into contact with the rotary shaft at the upper portion above the oil groove, and the lubricating oil supplied from the lateral hole is discharged to the lower side of the sub-bearing, whereby the discharge to the upper portion of the sub-bearing can be prevented.

Drawings

Fig. 1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention.

Fig. 2 is an enlarged sectional view of a main portion of the compression mechanism portion of fig. 1.

Fig. 3(a) is a plan view of a thrust bearing plate used in the hermetic compressor, and (b) is a plan view of an oil pump housing used in the hermetic compressor.

Detailed Description

In the 1 st aspect of the present invention, a rotation shaft oil supply hole is formed in a rotation shaft from a lower end portion of the rotation shaft to an upper portion of the rotation shaft, and the rotation shaft oil supply hole includes: an oil groove formed by a notch in the axial direction of the rotating shaft; and a lateral hole for communicating the rotary shaft oil supply hole with the oil groove, wherein a plate-side oil passage intermittently communicating with the oil groove is formed in the thrust bearing plate, a housing-side oil passage communicating with the plate-side oil passage is formed in the oil pump housing, and an upper portion of the sliding bearing is brought into contact with the rotary shaft at a position above the oil groove, whereby the lubricating oil supplied from the lateral hole is moved downward in the oil groove, and the lubricating oil in the oil groove is discharged below the sub-bearing via the plate-side oil passage and the housing-side oil passage. According to the first aspect of the present invention, the upper portion of the sliding bearing is brought into contact with the rotary shaft at the upper portion above the oil groove, and the lubricating oil supplied from the lateral hole is discharged to the lower side of the sub-bearing, whereby the lubricating oil can be prevented from being discharged to the upper portion of the sub-bearing. Therefore, since the lubricant can be prevented from scattering from the upper portion of the sub-bearing, the amount of lubricant discharged from the sealed container to the outside can be reduced.

In the 2 nd aspect of the present invention, in addition to the 1 st aspect, an oil reservoir space for storing lubricating oil discharged from the oil pump is formed in the center of the thrust bearing plate, and the plate-side oil passage is formed so as to communicate with the oil reservoir space and to extend in the radial direction from the oil reservoir space. According to the 2 nd aspect, the lubricating oil that flows from the oil pump directly into the thrust bearing plate via the space between the outer periphery of the lower end portion of the rotary shaft and the center hole of the oil pump housing is guided to the plate-side oil passage.

In the 3 rd aspect of the present invention, in the 2 nd aspect, the casing-side oil passage is formed by an inner groove and an outer groove formed in the upper surface of the oil pump casing, and a discharge hole formed in the outer end of the outer groove, the inner groove and the plate-side oil passage are overlapped and communicated, and the outer groove is covered with the thrust bearing plate. According to the aspect 3, the foreign matter mixed in the oil storing space can be easily discharged, and the discharge amount of the lubricating oil can be adjusted by the depth and the groove width of the outer groove covered with the thrust bearing plate.

In the 4 th aspect of the present invention, in addition to the 3 rd aspect, the outer groove covered with the thrust bearing plate has a cross-sectional area equal to or smaller than the lateral hole. According to the 4 th aspect, the lubricating oil supplied from the lateral hole can be appropriately retained in the sub-bearing and the thrust bearing plate.

In the 5 th aspect of the present invention, in addition to the 3 rd or 4 th aspect, the discharge hole is formed so as to penetrate the upper and lower surfaces of the oil pump housing. According to the 5 th aspect, since the discharge amount of the lubricating oil can be adjusted in the outer groove, it is not necessary to maintain the dimensional accuracy of the discharge hole, and the lubricating oil can be easily discharged.

(examples)

A hermetic compressor according to an embodiment of the present invention will be described below. The present invention is not limited to the following examples.

Fig. 1 is a longitudinal sectional view of the hermetic compressor of the present embodiment.

A compression mechanism 10 for compressing a refrigerant and an electric mechanism 20 for driving the compression mechanism 10 are disposed in the closed casing 1.

The closed casing 1 includes a cylindrical trunk portion 1a extending in the vertical direction, an upper cover 1c closing an upper opening of the trunk portion 1a, and a lower cover 1b closing a lower opening of the trunk portion 1 a.

The closed casing 1 is provided with a refrigerant suction pipe 2 for introducing the refrigerant into the compression mechanism 10, and a refrigerant discharge pipe 3 for discharging the refrigerant compressed by the compression mechanism 10 to the outside of the closed casing 1.

The compression mechanism 10 includes a fixed scroll 11 and an orbiting scroll 12.

The rotary shaft 13 orbits the orbiting scroll 12.

The electric mechanism 20 includes a stator 21 fixed to the sealed container 1 and a rotor 22 disposed inside the stator 21. The rotary shaft 13 is fixed to the rotor 22. An eccentric shaft 13a eccentric with respect to the rotary shaft 13 is formed at the upper end of the rotary shaft 13.

A main bearing 30 for supporting the fixed scroll 11 and the orbiting scroll 12 is provided below the fixed scroll 11 and the orbiting scroll 12.

The main bearing 30 is formed with a bearing portion 31 for pivotally supporting the rotary shaft 13 and a boss accommodating portion 32. The main bearing 30 is fixed to the hermetic container 1 by welding or shrink fitting.

The fixed scroll 11 includes a disk-shaped fixed scroll end plate 11a, a spiral fixed wrap 11b provided upright on the fixed scroll end plate 11a, and an outer peripheral wall portion 11c provided upright so as to surround the fixed wrap 11b, and a discharge port 14 is formed in a substantially central portion of the fixed scroll end plate 11 a.

The orbiting scroll 12 includes a disc-shaped orbiting scroll end plate 12a, an orbiting wrap 12b provided upright on a wrap-side end surface of the orbiting scroll end plate 12a, and a cylindrical boss portion 12c formed on a wrap-side end surface of the orbiting scroll end plate 12 a.

The fixed wrap 11b of the fixed scroll 11 and the orbiting wrap 12b of the orbiting scroll 12 mesh with each other, and a plurality of compression chambers 15 are formed between the fixed wrap 11b and the orbiting wrap 12 b.

The boss portion 12c is formed at substantially the center of the orbiting scroll end plate 12 a. The eccentric shaft 13a is inserted into the boss portion 12c, and the boss portion 12c is housed in the boss housing portion 32.

The fixed scroll 11 is fixed to the main bearing 30 at the outer peripheral wall 11c using a plurality of bolts 16. On the other hand, the orbiting scroll 12 is supported by the fixed scroll 11 via a rotation restricting member 17 such as an oldham ring. A rotation restricting member 17 that restricts rotation of the orbiting scroll 12 is provided between the fixed scroll 11 and the main bearing 30. Thereby, the orbiting scroll 12 orbits with respect to the fixed scroll 11 without rotating.

The lower end 13b of the rotary shaft 13 is pivotally supported by a sub-bearing 18 disposed at the lower part of the sealed container 1.

An oil reservoir 4 for storing lubricating oil is formed at the bottom of the sealed container 1.

A positive displacement oil pump 5 is provided at the lower end of the rotary shaft 13. The oil pump 5 is disposed such that its suction port is present in the oil reservoir 4. The oil pump 5 is driven by the rotary shaft 13, and can reliably suck up the lubricating oil in the oil reservoir 4 provided at the bottom of the hermetic container 1 regardless of the pressure condition or the operating speed, and eliminate the fear of oil depletion.

A rotation shaft oil supply hole 13c is formed in the rotation shaft 13 from the lower end portion 13b of the rotation shaft 13 to the eccentric shaft 13 a.

The lubricating oil sucked up by the oil pump 5 is supplied to the bearings of the sub-bearing 18, the bearing portion 31, and the boss portion 12c through the rotating shaft oil supply hole 13c formed in the rotating shaft 13.

The refrigerant sucked from the refrigerant suction pipe 2 is guided to the compression chamber 15 from the suction port 15 a. The compression chamber 15 moves from the outer peripheral side toward the center portion while reducing the volume, and the refrigerant having reached a predetermined pressure in the compression chamber 15 is discharged from the discharge port 14 provided at the center portion of the fixed scroll 11 to the discharge chamber 6. A discharge reed valve (not shown) is provided in the discharge port 14. The refrigerant having reached a predetermined pressure in the compression chamber 15 pushes open the discharge reed valve and is discharged into the discharge chamber 6. The refrigerant discharged to the discharge chamber 6 is guided to the upper portion in the closed casing 1, passes through a refrigerant passage (not shown) formed in the compression mechanism 10, reaches the periphery of the electric mechanism 20, and is discharged from the refrigerant discharge pipe 3.

Fig. 2 is an enlarged cross-sectional view of a main portion of the compression mechanism section of fig. 1, fig. 3(a) is a plan view of a thrust bearing plate used in the hermetic compressor, and fig. 3(b) is a plan view of an oil pump housing used in the hermetic compressor.

A sliding bearing 13e is disposed between the sub-bearing 18 and the lower end portion 13b of the rotary shaft 13.

The lower end portion 13b of the rotary shaft 13 has an oil groove 13f formed by a notch in the axial direction of the rotary shaft 13, and a lateral hole 13g communicating the rotary shaft oil supply hole 13c with the oil groove 13 f.

The thrust bearing plate 40 is disposed below the sub-bearing 18 and receives the thrust of the rotary shaft 13. The oil pump housing 50 is disposed below the thrust bearing plate 40. The oil pump 5 is housed in the lower surface of the oil pump housing 50.

An oil reservoir space 41 for storing the lubricating oil discharged from the oil pump 5 and a plate-side oil passage 42 communicating with the oil groove 13f are formed in the thrust bearing plate 40. The plate-side oil passage 42 extends from the outer diameter of the lower end portion 13b to the outside. The oil reservoir 41 is formed at the center of the thrust bearing plate 40. The plate-side oil passage 42 communicates with the oil reservoir space 41 and is formed to extend in the radial direction from the oil reservoir space 41. The outer groove 51b covered with the thrust bearing plate 40 has a cross-sectional area equal to or smaller than the cross-sectional area of the lateral hole 13 g.

The oil pump housing 50 is formed with a housing-side oil passage 51 that communicates with the plate-side oil passage 42. The casing-side oil passage 51 includes an inner groove 51a and an outer groove 51b formed in the upper surface of the oil pump casing 50, and a discharge hole 51c formed in the outer end of the outer groove 51 b.

The inner groove 51a is disposed to overlap the plate-side oil passage 42. Therefore, the inner groove 51a communicates with the plate-side oil passage 42. The outer slot 51b is covered by the thrust bearing plate 40. The discharge hole 51c is formed through the upper and lower surfaces of the oil pump housing 50. The discharge hole 51c may be formed by extending the outer end of the outer groove 51b to the outer peripheral portion of the oil pump housing 50.

The lubricating oil discharged from the oil pump 5 is supplied to the rotating shaft oil supply hole 13c from the lower surface of the lower end portion 13b, and may flow into the plate-side oil passage 42 from between the outer periphery of the lower end portion 13b and the center hole of the oil pump housing 50.

In the upper portion above the oil groove 13f, the upper portion of the sliding bearing 13e is brought into contact with the lower end portion 13b of the rotary shaft 13, thereby preventing the lubricating oil in the oil groove 13f from scattering from the upper portion of the sub-bearing 18.

The lubricating oil supplied from the lateral hole 13g moves downward in the oil groove 13 f. The lubricating oil in the oil groove 13f is discharged below the sub-bearing 18 via the plate-side oil passage 42 and the case-side oil passage 51.

According to the present embodiment, the lubricating oil supplied from the lateral hole 13g is discharged to the lower side of the sub-bearing 18, and thus can be prevented from being discharged to the upper side of the sub-bearing 18. Therefore, since the lubricant can be prevented from scattering from the upper portion of the sub-bearing 18, the amount of lubricant discharged from the sealed container 1 to the outside can be reduced.

Further, according to the present embodiment, the lubricating oil that flows from the oil pump 5 directly into the thrust bearing plate 40 via between the outer periphery of the lower end portion 13b and the center hole of the oil pump housing 50 is guided to the plate-side oil passage 42.

Further, according to the present embodiment, the foreign substances mixed in the oil reserving space 41 are easily discharged, and the discharge amount of the lubricating oil can be adjusted by the depth and the groove width of the outer groove 51b covered with the thrust bearing plate 40.

Further, according to the present embodiment, the lubricating oil supplied from the lateral hole 13g can be appropriately retained in the sub-bearing 18 and the thrust bearing plate 40.

Further, according to the present embodiment, since the discharge amount of the lubricating oil can be adjusted by the outer groove 51b, it is not necessary to maintain the dimensional accuracy of the discharge hole 51c, and the lubricating oil can be easily discharged.

R32, carbon dioxide, or a refrigerant having a double bond between carbon and carbon can be used as the refrigerant of the present invention.

Industrial applicability of the invention

The hermetic compressor of the present invention is used in a refrigeration cycle apparatus such as a hot water heating apparatus, an air conditioning apparatus, a water heater, or a refrigerator.

Description of the symbols

1 closed container

2 refrigerant suction pipe

3 refrigerant discharge pipe

4 oil storage part

5 oil pump

6 discharge chamber

10 compression mechanism part

11 fixed scroll

12-orbiting scroll

13 rotating shaft

13a eccentric shaft

13b lower end portion

13c rotating shaft oil supply hole

13e sliding bearing

13f oil groove

13g transverse hole

14 discharge port

15 compression chamber

16 bolt

17 rotation restricting member

18 pairs of bearings

20 electric mechanism part

21 stator

22 rotor

30 main bearing

31 bearing part

32 boss receiving part

40 thrust bearing plate

41 oil storage space

42 plate side oil passage

50 oil pump shell

51 casing side oil passage

51a inner side groove

51b outer slot

51c exit the orifice.

Claims

1. A hermetic compressor is characterized in that:

a compression mechanism for compressing a refrigerant and an electric mechanism for driving the compression mechanism by a rotary shaft are disposed in a closed container,

an oil reservoir for storing lubricating oil is formed at the bottom of the closed container,

the hermetic compressor includes:

a main bearing supporting an upper portion of the rotating shaft;

a sub-bearing supporting a lower end portion of the rotating shaft;

a sliding bearing disposed between the sub-bearing and the rotating shaft;

a thrust bearing plate disposed below the secondary bearing and receiving thrust of the rotary shaft;

an oil pump housing disposed below the thrust bearing plate; and

a positive displacement oil pump accommodated in a lower surface of the oil pump housing, wherein

A rotating shaft oil supply hole is formed in the rotating shaft from the lower end portion of the rotating shaft to the upper portion of the rotating shaft,

the rotating shaft has, at the lower end portion thereof:

an oil groove formed by a notch in the axial direction of the rotating shaft; and

a cross hole communicating the rotating shaft oil supply hole with the oil groove,

a plate-side oil passage intermittently communicating with the oil groove is formed in the thrust bearing plate,

a housing-side oil passage communicating with the plate-side oil passage is formed in the oil pump housing,

the upper portion of the sliding bearing is brought into contact with the rotary shaft at a position above the oil groove, whereby the lubricating oil supplied from the lateral hole is moved downward in the oil groove,

discharging the lubricating oil located in the oil groove below the sub-bearing via the plate-side oil passage and the case-side oil passage,

the casing side oil passage is constituted by an inner groove and an outer groove formed in an upper surface of the oil pump casing, and a discharge hole formed in an outer end of the outer groove,

the inner groove and the plate-side oil passage are overlapped and communicated,

the outboard slot is covered by the thrust bearing plate.

2. The hermetic compressor according to claim 1, wherein:

an oil reservoir space for storing the lubricating oil discharged from the oil pump is formed in the center of the thrust bearing plate,

the plate-side oil passage is formed so as to communicate with the oil reservoir space and to extend in a radial direction from the oil reservoir space.

3. The hermetic compressor according to claim 1, wherein:

the outer groove covered with the thrust bearing plate has a cross-sectional area equal to or smaller than the cross-sectional area of the lateral hole.

4. The hermetic compressor according to claim 1 or 3, characterized in that:

the discharge hole is formed to penetrate the upper and lower surfaces of the oil pump housing.